fanotify: mask out special event flags from ignored mask

The special event flags (FAN_ONDIR, FAN_EVENT_ON_CHILD) never had
any meaning in ignored mask. Mask them out explicitly.

Link: https://lore.kernel.org/r/20200716084230.30611-6-amir73il@gmail.com


Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>